Mpc 3500 serious problem

[mikadonovan]

I have a B222 that is exhibiting image problems. The windows test page is what it looks like when printing to the machine. The other page is what it looks like when copying from the glass or through the ADF. The internal prints ( counter sheet and SMC report) are just fine. It has a new K dev and drum unit, I swapped the image transfer belt unit from another machine, no effect. All color drum and dev units are at 30K. I'm guessing maybe a PCB associated with image processing. Anyone seen this before?

[teebee1234]

Those are definitely digital artifacts, not process related. Most likely it's the IPU board as it processes everything from the scanner and controller. The internal prints come from the BCU. First step would be to clean the contacts on everything, including the dimm and HDD..
I had a similar issue last week on an MP2050 except the dashes were vertical and lined up with the fonts. Initially reseating the boards would correct it, but it kept coming back so I ended up replacing the IPU.

[NeoMatrix]

Mikadonavan this is verbatim from the MPC3500 Service Manual

-----------------------------------------------------------------------------------------
VPU Test Mode

[teebee1234]

I would say the SBU if it only occured with scanned docs, but since the prints are exibiting the same issue then the only thing in common is the IPU.

[bbapst]

i had a bad memory dimm cause something similar to this.

[mike.guarderas@yahoo.com]

I have a B222 that is exhibiting image problems. The windows test page is what it looks like when printing to the machine. The other page is what it looks like when copying from the glass or through the ADF. The internal prints ( counter sheet and SMC report) are just fine. It has a new K dev and drum unit, I swapped the image transfer belt unit from another machine, no effect. All color drum and dev units are at 30K. I'm guessing maybe a PCB associated with image processing. Anyone seen this before?

This is your memory dimm on your controller

[E Winter]

I'd go for the memory dimm as well - maybe a contact problem or it's somehow corrupted. It's also possible that you have an improper or broken cable connection somewhere in the scanner-related components. It's also possible that the CCD Unit(SBU) or IPU is faulty (take a close look at NeoMatrix posting). Last but not least: The NV-Ram - it can cause some really strange behaviours.

In case you have a spare machine I'd use these parts to encircle the problem. Don't forget to print the NV Ram data on both machines and do an NV Ram backup via SD-Cards as well. In case you have to change the CCD unit you'll have to adjust some scanner related SPs (RGB shading correction...). This can be easily done with the Non-default SMC page of the cannibalised machine.

[iMind]

The NV-Ram - it can cause some really strange behaviours.

x2

[mikadonovan]

I reseated the ribbon cable connector from the IOB to the IPU and reseated the memory DIMMS in the controller- so far so good. I'll run it through the wringer before delivery .Looks like a good call on the memory.

[sg01]

I confirmed that the high possible source which causes this problem is the IPU. Sometimes, by just disconnecting all the ribbons cables and reconnecting, might help. More often then so, I will change the IPU board once this problem surfaces.

[peterxu256]

Re: Mpc 3500 serious scanner problem

I have encountered a much similar problem: MPC3000 Image Processing problem on Color mode only. Enclosed are sample for Color mode and BW mode. Need some advice to trace down root cause. SP4-904-1 Register Acess Tested OK(all five Zeros), But 4-904-2 Tested Not Good, (code: 00003) The Red band always happened Rear Side. sub-scan direction.
Advice Appreciated

[peterxu256]

CCD filter Scan line Correction

Enclosed is scanning from platen cover, the Reddish shading on top rear improved a little after erasing blank margin, but still there. is there anyone know Sp4991 Image Pass Selection, default 2 now after firmware updated, say " RGB RGB image done by shading correction(shading on, black offset ON. Changing to option "5" : RGB image done by line skipping correction as per Service Manual. Machine don't allow to change, keep 2 selection. Is there another sp mode to the filter parameter of CCD?
Thanks

[davel]

Re: CCD filter Scan line Correction

Enclosed is scanning from platen cover, the Reddish shading on top rear improved a little after erasing blank margin, but still there. is there anyone know Sp4991 Image Pass Selection, default 2 now after firmware updated, say " RGB RGB image done by shading correction(shading on, black offset ON. Changing to option "5" : RGB image done by line skipping correction as per Service Manual. Machine don't allow to change, keep 2 selection. Is there another sp mode to the filter parameter of CCD?
Thanks

Put all your settings back to factory, give machine good clean, change any parts due, stop fiddling with settings, I have never had to change any of these.

[peterxu256]

Re: CCD filter Scan line Correction

Put all your settings back to factory, give machine good clean, change any parts due, stop fiddling with settings, I have never had to change any of these.

Attached file really show natural white light reflecting the reddish light through photocopier's lens for CCD processing,
Is there any one knowing it?